https://www.reuters.com/article/us-health-coronavirus-britain/uks-covid-19-tracking-system-under-fire-amid-warning-of-second-spike-idUSKBN22X0KZ >Britain's system for tracing those with the novel coronavirus was under fire on Thursday as it grappled with the development of a tracking app and health workers warned the government that unless there was clarity it could suffer a second deadly wave.